11221011220021 has 8 divisors (see below), whose sum is σ = 11268763781400. Its totient is φ = 11173357017600.

The previous prime is 11221011219997. The next prime is 11221011220039. The reversal of 11221011220021 is 12002211012211.

It can be written as a sum of positive squares in 4 ways, for example, as 2256346468996 + 8964664751025 = 1502114^2 + 2994105^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11221011220021 - 2⁷ = 11221011219893 is a prime.

It is a super-2 number, since 2×11221011220021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221011219977 and 11221011220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221011220051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24361086 + ... + 24817423.

It is an arithmetic number, because the mean of its divisors is an integer number (1408595472675).

Almost surely, 2^{11221011220021} is an apocalyptic number.

It is an amenable number.

11221011220021 is a deficient number, since it is larger than the sum of its proper divisors (47752561379).

11221011220021 is an equidigital number, since it uses as much as digits as its factorization.

11221011220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49179479.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11221011220021 its reverse (12002211012211), we get a palindrome (23223222232232).

The spelling of 11221011220021 in words is "eleven trillion, two hundred twenty-one billion, eleven million, two hundred twenty thousand, twenty-one".